PIC16HV540T-20/SS - 8-Bit 20MHz OTP MCU with Shunt Regulator | Microchip
料号： PIC16HV540T-20/SS ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.1 | $3.10 |
| 10 | $2.79 | $27.90 |
| 100 | $2.41 | $241.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.96 | $1,960.00 |
PIC16HV540T-20/SS 概述
An 8-bit PIC microcontroller is a RISC-based single-chip computer that combines a CPU, non-volatile program memory, RAM, and peripherals on a single silicon die. PIC microcontrollers sit within the broader taxonomy of microcontrollers -> embedded processors -> semiconductor ICs. The PIC16HV540 belongs to the enhanced PIC16C5x family and is designed for cost-sensitive, high-voltage applications where a small instruction set, deterministic timing, and minimal external components are priorities. The integrated shunt regulator simplifies power design in industrial control and automotive subsystems.
Key features include 33 single-word single-cycle instructions delivering 2:1 code compression versus typical 8-bit CISC architectures, a wide 3.5 V to 15 V supply range accommodated by the on-chip regulator, 12 I/O pins with high-current sink capability, an 8-bit timer/counter, and a watchdog timer for reliable unattended operation. The device supports external RC and crystal oscillator modes and offers a power-saving SLEEP mode. Twelve-bit-wide instructions simplify arithmetic-heavy code.
The PIC16HV540 architecture uses a Harvard-style two-bus design separating program and data memory, enabling simultaneous instruction fetch and operand access. The OTP program memory uses EPROM cells that are one-time programmable, suitable for low-to-medium volume production. The integrated shunt regulator monitors VDD and clamps excess voltage, allowing direct connection to loosely regulated rails such as 12 V battery or 24 V industrial supplies after a series dropping resistor.
Typical applications include battery chargers, LED drivers, capacitor discharge circuits, remote controls, and simple sensor interfaces where the wide supply tolerance eliminates external regulation. The PIC16HV540 is well-suited to appliance controls, automotive accessory modules, and standalone low-cost embedded controllers.
When designing with this part, choose the series dropping resistor so that worst-case shunt current remains above the regulator minimum (typically 5 mA) at the lowest expected input voltage. Add adequate bulk capacitance at VDD to absorb inrush current and decouple high-frequency noise from the shunt regulator.
This page consolidates distributor pricing, drop-in SSOP-20 alternatives within the PIC16HV540 family, and design guidance not present on a typical catalog page.
直接替换替代料： PIC16HV540T-20/SS ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16HV540T-20/SS （相同外形与封装尺寸） ——差异在于 Package, Watchdog Timer, Core Architecture, Operating Temperature, Program Memory Size.
快速对比工具——选择替代料号进行并排对比：
PIC16HV540T-20I/SS
✅ 直接替换✓ 有现货
$1.45 / 个
查看数据手册 →PIC16HV540-20I/SS
✅ 直接替换✓ 有现货
$1.45 / 个
查看数据手册 →PIC16HV540-20/SS
✅ 直接替换✓ 有现货
$1.8 / 个
查看数据手册 →PIC16HV540T-04/SS
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC16HV540T-04I/SS
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PIC16HV540T-20/SS 最大额定值与电气特性
| Core | 8-bit PIC (enhanced PIC16C5x) |
| Instruction Set Width | 12-bit |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 768 B (512 x 12) |
| RAM Size | 25 x 8 bytes (25 B) |
| Number of Instructions | 33 (single-word, single-cycle) |
| Supply Voltage Range | 3.5 V to 15 V (via on-chip shunt regulator) |
| On-Chip Regulator | Shunt type (HV suffix) |
| I/O Pins | 12 |
| Timers | 8-bit timer/counter (TMR0) |
| Watchdog Timer | Yes (on-chip WDT) |
| Oscillator Modes | External RC, external crystal/ceramic resonator |
| Power-Saving Mode | SLEEP mode |
| 封装 | 20-pin SSOP (5.30 mm body width, 0.65 mm pitch) |
| 安装类型 | Surface Mount |
| 工作温度 | 0 C to +70 C (commercial) |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
PIC16HV540T-20/SS 引脚配置
| 引脚 1 | RA2 — Port A bit 2 (bidirectional I/O) |
| 引脚 2 | RA3 — Port A bit 3 (bidirectional I/O) |
| 引脚 3 | RTCC — Timer/counter clock input (also RA4) |
| 引脚 4 | MCLR — Master clear reset input (active low) |
| 引脚 5 | VSS — Ground reference |
| 引脚 6 | RB0 — Port B bit 0 (bidirectional I/O) |
| 引脚 7 | RB1 — Port B bit 1 (bidirectional I/O) |
| 引脚 8 | RB2 — Port B bit 2 (bidirectional I/O) |
| 引脚 9 | RB3 — Port B bit 3 (bidirectional I/O) |
| 引脚 10 | RB4 — Port B bit 4 (bidirectional I/O) |
| 引脚 11 | RB5 — Port B bit 5 (bidirectional I/O) |
| 引脚 12 | RB6 — Port B bit 6 (bidirectional I/O) |
| 引脚 13 | RB7 — Port B bit 7 (bidirectional I/O) |
| 引脚 14 | VDD — Positive supply (regulated internally by shunt regulator) |
| 引脚 15 | OSC2 — Oscillator output (crystal/RC mode) |
| 引脚 16 | OSC1 — Oscillator input (crystal/RC/external clock) |
| 引脚 17 | RA0 — Port A bit 0 (bidirectional I/O) |
| 引脚 18 | RA1 — Port A bit 1 (bidirectional I/O) |
| 引脚 19 | NC — Not connected (per datasheet pinout) |
| 引脚 20 | NC — Not connected (per datasheet pinout) |
典型应用
PIC16HV540T-20/SS 适用于 6 应用s: 12 V / 24 V Industrial Control, Battery Chargers and Capacitor Discharge Circuits, LED Drivers and Lighting Controllers, Automotive Accessory Modules, Remote Controls and IR Emitter Nodes, Appliance Control Boards.
12 V / 24 V Industrial Control
The PIC16HV540T-20/SS is purpose-built for 12 V and 24 V industrial control boards where the on-chip shunt regulator eliminates an external 5 V LDO, cutting BOM cost and PCB area. Its 3.5-15 V supply tolerance accommodates loosely regulated factory rails. At 20 MHz it can scan digital inputs, debounce mechanical switches, and drive relays within sub-millisecond cycle times, while the 33-instruction RISC core keeps firmware small (typical 512-instruction OTP budget). The 12 I/O pins map cleanly to relay banks, opto-isolated inputs, and status LEDs, and the integrated watchdog timer guards against firmware lockups in unattended field installations.
推荐
Battery Chargers and Capacitor Discharge Circuits
The PIC16HV540T-20/SS suits single-cell or multi-cell NiCd/NiMH chargers and high-voltage capacitor discharge timing applications. Its 15 V shunt-regulated supply tolerates direct connection to rectified mains-derived rails after a dropping resistor. The 200 ns instruction cycle enables precise PWM duty-cycle generation for constant-current charging, while the 8-bit timer/counter can measure discharge intervals with microsecond resolution. The on-chip watchdog prevents runaway charge cycles if firmware execution stalls, and SLEEP mode reduces quiescent draw between charge events to extend standby time on battery-powered units.
推荐
LED Drivers and Lighting Controllers
In LED driver and lighting controller designs the PIC16HV540T-20/SS can drive constant-current LED strings directly from 12 V or 24 V rails without external regulation, using its 12 high-current-sink I/O pins for multiplexed PWM dimming. At 20 MHz it supports 8-bit PWM resolution at refresh rates well above 100 Hz, eliminating visible flicker. The shunt regulator tolerates the wide supply swing of long LED strings or boost-converter outputs. SLEEP mode plus WDT enables duty-cycled night-light designs where the MCU wakes periodically to adjust brightness, drawing only microamp-level standby current between active intervals.
推荐
Automotive Accessory Modules
The PIC16HV540T-20/SS is well-suited to automotive accessory modules such as aftermarket alarm keypads, interior lighting controllers, and HVAC damper actuators powered from the 12 V battery rail. The on-chip shunt regulator survives load-dump transients up to 15 V steady-state and tolerates cranking voltage drops down to 3.5 V. Its 20 MHz CPU debounces switch inputs and drives multiplexed LED or 7-segment displays in real time. The 33-instruction RISC core simplifies MISRA-style firmware reviews, and the wide operating temperature range of the -I variant suits under-dash and engine-bay environments.
推荐
Remote Controls and IR Emitter Nodes
The PIC16HV540T-20/SS fits low-cost IR remote controls and standalone sensor-emitter nodes powered from 9 V batteries or unregulated DC adapters. The 3.5-15 V shunt-regulated supply range accepts a depleted 9 V battery down to its cutoff without an external boost or buck regulator. At 20 MHz the MCU generates precise 38 kHz carrier waveforms for IR transmission with sub-microsecond timing accuracy. SLEEP mode plus the watchdog timer enables multi-year battery life by waking the MCU only on button press or scheduled sensor read, holding standby current in the microamp range.
推荐
Appliance Control Boards
White-goods and small appliance control boards (coffee makers, washing-machine sub-modules, fan speed controllers) benefit from the PIC16HV540T-20/SS's combination of direct 12 V operation, OTP memory for low-cost mass production, and 33 deterministic single-cycle instructions. The MCU reads triac-zero-cross detectors, drives opto-isolated triac gates, and implements simple PI loops for temperature or motor-speed regulation. The 12 I/O pins handle keypad scanning, LED status, and relay outputs, while the 8-bit timer/counter generates zero-crossing interrupts without CPU overhead.
推荐
推荐产品汇总
工程参考数据： PIC16HV540T-20/SS ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16HV540T-20I/SS | PIC16HV540-20I/SS | PIC16HV540-20/SS | PIC16HV540T-04/SS | PIC16HV540T-04I/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) | 20-SSOP (same) |
| CPU Speed | 20 MHz (200 ns instruction cycle) | 20 MHz (same) | 20 MHz (same) | 20 MHz (same) | 4 MHz (-80%) | 4 MHz (-80%) |
| Program Memory | 768 B OTP (512 x 12) | 768 B OTP (same) | 768 B OTP (same) | 768 B OTP (same) | 768 B OTP (same) | 768 B OTP (same) |
| RAM Size | 25 B (25 x 8) | 25 B (same) | 25 B (same) | 25 B (same) | 25 B (same) | 25 B (same) |
| Supply Voltage Range | 3.5 V to 15 V (shunt regulator) | 3.5 V to 15 V (same) | 3.5 V to 15 V (same) | 3.5 V to 15 V (same) | 3.5 V to 15 V (same) | 3.5 V to 15 V (same) |
| Operating Temperature | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) |
| Packaging Format | Tape & Reel (T suffix) | Tape & Reel (T suffix) | Tube (no T suffix) | Tube (no T suffix) | Tape & Reel (T suffix) | Tape & Reel (T suffix) |
关键差异点
- On-chip high-voltage shunt regulator eliminates external 5 V LDO （对比 PIC16F690T-I/SS)
- Wide 3.5 V to 15 V supply range with internal regulation （对比 PIC16C54 (non-HV))
- 33-instruction RISC core with 2:1 code compression （对比 PIC16F84A)
设计说明
The on-chip shunt regulator requires a series dropping resistor between the unregulated input (for example a 12 V or 24 V rail) and the VDD pin. Per the datasheet, choose R_series so that worst-case input voltage still leaves enough headroom across the shunt regulator at minimum load. Estimated: for a 12 V nominal input dropping to 5 V internal VDD at 5 mA minimum regulator current, R_series approximates (12 V - 5 V) / 5 mA = 1.4 kohm. Verify with bench measurements across temperature. Place a bulk decoupling capacitor (>= 1 uF) directly at VDD.
The 20-SSOP package has a 0.65 mm pitch and 5.30 mm body width. Follow standard SSOP-20 PCB guidelines: 0.4 mm pad width, 0.2 mm solder mask expansion, and a ground plane on the opposite side stitched with thermal vias near VDD/MCLR to dissipate shunt regulator heat. Keep the OSC1/OSC2 traces short and shielded from switching signals to avoid clock noise coupling into the timer/counter input.
Do not confuse the PIC16HV540 (HV = high-voltage shunt regulator) with the standard PIC16C54 or PIC16F54, which require a regulated 5 V supply. Connecting the non-HV part to a 12 V rail will destroy it. Also note that OTP program memory cannot be erased; plan firmware revisions carefully. The PIC16HV540T-20/SS uses 12-bit-wide instructions, so programmers expecting 14-bit PIC16Fxx instruction widths will need PIC16C5x-specific tooling.
合规信息
RoHS and REACH compliant per Microchip product page and DigiKey listing. Not AEC-Q100 qualified; for automotive safety-critical applications select an AEC-Q100-qualified PIC16F or PIC18 part instead. Lead-free SSOP-20 package.
